Totally enclosed dynamoelectric machine



Oct. 8, 1940. R BAUDRY I 2,217,431-

TOTALLY ENCLOSED DYNAMOELECTRIC MACHINE Filed June 28, 1938 INVENTOR @6776 A. Baud/y.

BYQKZ:

ATTORNEY WITNESSES:

.Pate-ntedioct 8,219.40 r e r UNITED STATES PATENT OFFICE TOTALLY ENCLOSED DYNAMOELECTRIC MACHINE Ren A. Baudry, Pittsburgh, Pa., assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvan a Application June 28, 1938, Serial No. 216,234

10 Claims. (Cl. 171252) The present invention relates to large, totally desired, be formed of several sections bolted or enclosed dynamoelectric machines, and, more otherwise secured together. The housing is closed particularly, to the ventilation of such machines. at the end by a suitable end head 2 and is sup- Dynamoelectric machines of large size, such as ported on a foundation 3.

synchronous generators and synchronous con- A stator core 4 of the usual laminated con- 5 densers, usually operate at speeds ranging from struction, providing radial ventilating ducts, is 600 to as high as 3600 revolutions per minute, supported on the interior of the housing by cirand because of this high speed special attention cumferential web members 52nd longitudinal ribs must be given to the ventilation of these ma- 6 in which openings 1 are formed to permit the chines in order to obtain the greatest possible flow of hydrogen. Suitable stator windings 8 10 output. In many cases, it is necessary or deare placed in slots in the stator core 4. The sirable to use a more eificient cooling medium rotor member of the machine comprises a body than air, and in such cases hydrogen is usually portion 9 secured to a shaft 10 and having a used. When hydrogen is used as the cooling plurality of salient pole pieces H secured to it,

medium, the machine must be totally enclosed carrying suitable field windings [2. A fan I3 of in a gas-tight housing in order to prevent escape any suitable type is mounted on the shaft ill in of the gas or its contamination by air, and some order to circulate the hydrogen through the means must then be provided to cool the gas machine. within the housing. This is usually done by The shaft I0 is supported for rotation in a means of coolers placed inside the housing bearing M which rests on a bearing support I5 20 through which water, or other cooling medium, in the end portion of the housing I. The bearmay be circulated. It is obviously desirable to so ing support I5 is preferably in the form of a arrange these coolers that they will take up as generally rectangular, hollow member which exlittle space in the machine as possible so as not tends transversely across the housing from one to increase the necessary size of the housing side to the other and passes through it at each 25 unduly, and also that they should be so arranged end, as shown in Fig. 2. The joints between the that they will be easily accessible for inspection housing and th bearing pp e p rab y and maintenance. welded or otherwise made gas-tight. Large open- The object of the present invention is to proings K6 are formed in the vertical sides of the vlde an improved arrangement for cooling and bearing support and openings H are provided in 30 ventilating gas in a large, totally enclosed its bottom Surfaces Bracing d upp dynamoelectric machine, members l8 are provided beneath the bearing A more specific object is to provide an arrangesupport 15 to assist in supporting the weight of ment of coolers for such machines which will the bearing and rotor.

give a very compact construction and will make A cooler IQ for the hydrogen is mounted in 35 the coolers easily accessible for inspection and the hOllOW bearing pp and as ow in maintenance. Fig. 2, the cooler extends completely through the Further objects and advantages will be apsupport from one side of the machine to the parent from the following detailed description other. The cooler is preferably of the usual taken in connection with the accompanying water-tube type, consisting of aplurality of tubes 40 d w in which! 20 which extend between headers 2| at opposite Figure l is a partial longitudinal sectional view ends of the cooler. Water flows in through a of a large, totally enclosed dynamoelectric maconnection 22, passes through certain of the tubes chine; and to the header 2! at the opposite end, and then Fig. 2 is a transverse sectional view taken apreturns through the other tubes and is dis- 45 proximately on the line II--II of Fig. 1. charged through another similar connection.

The invention is shown in the drawing for the The cooler extends beyond the ends of the bearpurpose of illustration as embodied in a syning support 15 and is secured to it at each end chronous condenser, and since both ends of the with a gas-tight connection, as indicated at 23.

machine are of identical construction, only one Suitable covers 24 are provided for the ends of 50 end is illustrated and described. This machine the cooler. is adapted to be cooled by means of hydrogen, In order to properly direct the flow of hydrogen or a similar gaseous cooling medium, and is, or other ventilating gas, an inner end bell 25 is therefore, completely enclosed by a generally secured to the end of the stator member, and 66 cylindrical gas-tight housing I, which may, if extends radially inward to adjacent the fan I1 An outer end bell is secured to the inner end bell and comprises a baiile member 26 and duct members 21. The baflie member 26 is secured at its upper end to the inner end bell 25 and extends downward around the shaft l0 and is secured at its lower end to the bearing support ID, as indicated at 28. The duct members 21 are secured to each side of the member 26 and their lower ends are secured to the bearing support I! and extend outwardly to the housing, as clearly shown in Fig. 2. The outer edges of these members are secured to the end bell 25, so that the heated hydrogen discharged from the stator member cannot flow back directly into the machine without passing through the cooler, and the assembly of members 26 and 21 thus forms a duct to direct the cooled gas into the inner end bell.

In operation, the hydrogen blown into the machine by the fan ll passes around the field poles H and through the radial ducts of the stator core 4. The gas then flows axially of the machine through the openings I and is discharged into the end portion of the housing I and the end head 2. It then flows downward past the bearing and through the cooler IS in the hollow bearing support, and is drawn by the fan l3 through the duct members 21 and into the inner end bell 25 where it is again blown into the machine.

It will be seen from the above description that a construction has been provided which gives a very compact arrangement of the machine, since the cooler is located within the bearing support. This gives more room inside the housing for the bearing and associated parts, and since the bearing-support and hearing are located in the end portion of the housing itself, the overall length of the machine is kept to a minimum. The arrangement of the inner and outer end bells makes it possible to direct the flow of the hydrogen in the desired manner without the necessity of any complicated arrangement of ducts, and accordingly gives a very simple construction. It will also be noted that the cooler is easily accessible for inspection and maintenance since both ends extend outside the housing.

The invention has been described with reference to a synchronous condenser, but it should be understood that it is not so limited in its application and it may be used equally well in connection with other similar machines, such as synchronous generators or frequency changers. Any other suitable gaseous cooling medium may be used instead of hydrogen, if desired.

Although a specific embodiment of the invention has been illustrated and described, it is to be understood that it is not limited to the exact details of construction shown, but that, in its broadest aspects, it includes all equivalent embodiments and modifications which come within the scope of the appended claims.

I claim as my invention:

1. A totally enclosed dynamoelectric machine comprising a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, a bearing for the rotor member within the housing near the end thereof, a hollow support for said hearing within the housing, and a cooler in the housing for the gas, said cooler being mounted in the support.

2. A totally enclosed dynamoelectric machine comprising a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, a bearing for the rotor member within the housing near the end thereof, a hollow support tor the bearing extendingtransverselyacrossthehousing,andacoolcr in the housing for the gas, said cooler being mounted in the support.

3. A totally enclosed dynamoelectric machine comprising a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, a bearing for the rotor member within the housing near the end thereof, a hollow supporting member for the bearing within the housing, and a cooler for the gas extending transversely across the housing through said supporting member.

4. A totally enclosed dynamoelectric machine comprising a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, a hollow member extending transversely across the housing near the end thereof, a bearing for the rotor member supported on said hollow member, and a cooler for the gas extending through the hollow member.

5. A totally enclosed dynamoelectric machine comprising a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, an end head closing the end of the housing, a bearing for the rotor member within the housing near the end thereof, a hollow support for said bearing mounted in the housing, a cooler for the gas mounted in the support, and means for causing the gas to flow from'the machine into the end of the housing and then through the cooler and back into the machine.

6. A totally enclosed dynamoelectric machine comprising a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, an end head closing the end of the housing, a bearing for the rotor member within the housing near the end thereof, a hollow support for the bearing mounted in the housing and extending transversely across it, a cooler for the gas mounted in the support, and means for causing the gas to flow from the machine into the end of the housing and then through the cooler and back into the machine.

7. A totally enclosed dynamoelectric machine comprising a stator member, a rotor member, a gas-tight housing enclosing said members and containing a ventilating gas, a hollow bearing support in the end portion of the housing, a hearing for the rotor member on the support, a cooler for the gas within the support, an end head closing the end of the housing, and means for directing the flow of gas from the machine into the end head and then through the cooler and back into the machine.

8. A totally enclosed dynamoelectric machine comprising a stator member, a rotor member, a gas-tight housing enclosing said members and containing a ventilating gas, a hollow bearing support extending transversely across the housing near its end, a bearing for the rotor member on the support, a cooler for the gas extending across the housing within the hollow bearing support, an end head closing the end of the housing, and means to direct the flow of gas from the machine into the end head and then through the cooler and back into the machine.

9. A totally enclosed dynamoelectric machine having a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, an end head closing the end of the housing, a hollow bearing support mounted in the housing near the end thereof, a bearing for the rotor member on the bearing support, a cooler for the ventilating gas mounted in the bearing support, said bearing support having openings to permit the gas to flow through it, means for circulating the gas through-the machine, and means for directing the flow of gas from the machine into the end of the housing and the end head and then through the cooler and back into the machine.

10. A totally enclosed dynamoelectric machine having a stator member and a rotor member, a gas-tight housing enclosing the machine and containing a ventilating gas, an end head closing the end of the housing, a hollow bearing support mounted in the housing near the end thereof and extending transversely across the housing below the longitudinal axis, a bearing for the rotor member on the bearing support, a cooler for the ventilating gas mounted in the bearing support and extending across the housing", at least one end of the cooler extending outside the housing, said bearing support having openings to permit the gas to flow through it, means for circulating the gas through the machine, and means for directing the flow of gas from the machine into the end of the housing and the end head and then through the cooler and back into the machine.

RENE A. BAUDRY. 

